CN202581984U - Frequency-conversional multi-connected air-conditioning system - Google Patents
Frequency-conversional multi-connected air-conditioning system Download PDFInfo
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- CN202581984U CN202581984U CN201220165933.2U CN201220165933U CN202581984U CN 202581984 U CN202581984 U CN 202581984U CN 201220165933 U CN201220165933 U CN 201220165933U CN 202581984 U CN202581984 U CN 202581984U
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- 238000004378 air conditioning Methods 0.000 title abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
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- 239000003921 oil Substances 0.000 claims description 328
- 239000010687 lubricating oil Substances 0.000 claims description 89
- 238000003860 storage Methods 0.000 claims description 74
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Abstract
The utility model discloses a frequency-conversional multi-connected air-conditioning system which comprises a frequency conversion compressor, a fixed-frequency compressor, a frequency conversion oil separator, a fixed-frequency oil separator, a four-way valve, a first one-way valve, a second one-way valve, a first pipeline, a plurality of capillary pipelines, an oil path control module and an oil return detection module, wherein the oil path control module is used for carrying out corresponding oil path control according to the work frequency of the frequency conversion compressor and the operation state of the fixed-frequency compressor; and the oil return detection module is used for judging whether oil return operation is required or not while being used for carrying out oil path control and starting oil return operation when the oil return operation is required. According to the frequency-conversional multi-connected air-conditioning system disclosed by the utility model, the oil path control module can be used for carrying out corresponding oil path control according to the operation state of a frequency-conversional multi-connected air-conditioner, and thus the sufficient oil amount in the compressor can be ensured and the phenomenon that the compressor lacks of oil or is non-uniform in oil separation is avoided. In addition, the intelligent oil return is realized by oil return detection of the oil return detection module while the oil path control is carried out.
Description
Technical field
The utility model relates to air-conditioning technical field, relates in particular to a kind of connected machine system.
Background technology
The connected machine is claimed " VRV (Varied Refrigerant Volume) " or " VRF (Variable Refrigerant Fluid) " in the industry class, just get into Chinese market in the nineties in last century.Because this series products is applied widely, so market demand rises year by year.And the connected machine is by initial complete system import whole domestic productions till now; By initial AC frequency conversion DC frequency-changing till now; Especially the core component compressor also domesticizes, and it is much more online than the DC frequency-changing new cooling media of generation advanced technology that domestic producer has also released a generation successively.
Compressor is one of main parts of refrigeration system, is described as " heart " of system.Lubricating oil is to the material of lubricate between the moving component in the compressor, and it is dissolved in the refrigerant and with refrigerant and in inside and outside machine system pipeline, flows.Lubricating oil can make between the rubbing surface of each moving component in the compressor and form oil film, thereby reduces frictional force, reduce frictional heat and parts depreciation, and then improves reliability, durability and the efficient of compressor.If the compressor lubricant oil disappearance, compressor electric motor bearing and compression chamber will can not get effectively lubricating, thereby make motor be under the overwork condition; Electric machine temperature rise surpasses designing requirement, and the insulating barrier of motor is aging rapidly, and the class of insulation descends; Finally cause insulating barrier damaged, burn compressor.
Many on-line systems are because system loading is very big; Outer machine adopts two or three compressors to work simultaneously usually; And coolant piping is longer between the inside and outside machine; If outer machine cooling system oil return flow path designs is bad, the adverse consequences that finally causes compressor to burn the lubricants capacity maldistribution appears easily between the compressor of outer machine even is taken away by refrigerant because of lubricating oil making the part compressor lack oil.
Many on-line systems compressor lubricant oil control in the market has a variety of, but the existing lubricant control method all need regularly be carried out oil return control, and the oil return cycle is also shorter, and the realization that gets into oil return in optimum is difficult.And all be before vacuumizing, to inject low-pressure liquid storing tank to appending of lubricating oil, get back to compressor after lubricating oil and refrigerant dissolve each other behind the compressor operating, the minimum that can't reliably guarantee lubricating oil and the refrigerant ratio that dissolves each other.
The utility model content
The main purpose of the utility model provides a kind of connected machine system, is intended to guarantee that the lubricating oil of each compressor is balanced, respectively compresses the function reliability service thereby make.
The utility model provides a kind of connected machine system, comprises frequency-changeable compressor, invariable frequency compressor, frequency conversion oil eliminator, fixed oil eliminator, cross valve, first check valve, second check valve, first pipeline, some capillaries frequently; The exhaust outlet of said frequency-changeable compressor is connected with cross valve through frequency conversion oil eliminator, first check valve, first pipeline, and the oil return opening of said frequency conversion oil eliminator is connected with the return-air mouth of invariable frequency compressor through capillary; The exhaust outlet of said invariable frequency compressor is connected with cross valve through fixed oil eliminator, second check valve, first pipeline frequently, and the oil return opening of said fixed oil eliminator frequently is connected with the return-air mouth of frequency-changeable compressor through capillary; Wherein, also comprise:
Be used for carrying out the oil circuit control module that oil circuit is controlled according to the operating frequency of frequency-changeable compressor and the running status of invariable frequency compressor; Comprise oil storage tank, first magnetic valve, second magnetic valve, second pipeline and the 3rd check valve; The top outlet of said oil storage tank is connected with an end of the 3rd check valve; The lower part outlet of said oil storage tank is connected with an end of first magnetic valve, and the other end of the other end of the 3rd check valve and first magnetic valve all is connected with frequency-changeable compressor and invariable frequency compressor through capillary; The top outlet of said oil storage tank also is connected with fixed oil eliminator frequently through second magnetic valve; The end that said oil storage tank is connected with magnetic valve also is connected with first pipeline through second pipeline;
Be used for when carrying out oil circuit control; Need to judge whether the oil return operation; And needing oil return when operation to start the oil return detection module of oil return, comprise first temperature-detecting device of the temperature that is used to detect the refrigerant of carrying between frequency-changeable compressor and the frequency conversion oil eliminator and be used to detect second temperature-detecting device of the surface temperature capillaceous between second magnetic valve and frequency-changeable compressor and the invariable frequency compressor; Said first temperature-detecting device is arranged on the pipeline of the exhaust outlet that connects said frequency-changeable compressor and said frequency conversion oil eliminator, and said second temperature-detecting device is arranged on the pipeline of the said capillary of connection and frequency-changeable compressor and invariable frequency compressor return-air mouth.
Preferably, said first magnetic valve in the said oil circuit control module moves at invariable frequency compressor, and is when frequency-changeable compressor is in medium-high frequency when operation or low-frequency operation, closed and continue to break off behind first preset time; Said second magnetic valve breaks off behind closed and lasting second preset time after first magnetic valve breaks off.
Preferably, the temperature that said oil return detection module is detected at the temperature that is detected according to first temperature-detecting device and second temperature-detecting device is judged to start oil return when not having lubricating oil in the oil storage tank.
Preferably, said first magnetic valve in the said oil circuit control module moves at frequency-changeable compressor, when invariable frequency compressor is out of service, breaks off behind closed and lasting the 3rd preset time; Said second magnetic valve breaks off behind closed and lasting the 4th preset time after first magnetic valve breaks off.
Preferably; The temperature that said oil return detection module is detected at the temperature that is detected according to first temperature-detecting device and second temperature-detecting device; Do not judge when not having lubricating oil in the oil storage tank to start invariable frequency compressor, start oil return simultaneously, and after oil return finishes, close invariable frequency compressor.
Preferably; Said first magnetic valve in the said oil circuit control module is closed when the connected machine uses for the first time; And the temperature that the temperature that is detected according to first temperature-detecting device at said oil return detection module and second temperature-detecting device are detected is judged and is closed said first magnetic valve when lubricating oil in the oil storage tank has all been arranged.
Preferably, also comprise low-pressure liquid storing tank, the 3rd magnetic valve, the 4th magnetic valve, total return-air duct, indoor set and off-premises station heat exchanger; Said cross valve is connected with first pipeline, indoor set, off-premises station heat exchanger and low-pressure liquid storing tank respectively; The outlet of said low-pressure liquid storing tank through total return-air duct respectively with the return-air buckle of said frequency-changeable compressor and invariable frequency compressor, the bottom oil drain out of said low-pressure liquid storing tank is connected with total return-air duct through the 3rd magnetic valve; Said first pipeline also is connected with total return-air duct through the 4th magnetic valve.
Preferably, also comprise the 3rd temperature-detecting device of the temperature that is used for detecting the refrigerant of discharging from invariable frequency compressor, the bottom oil drain out that is used for detecting the temperature of total return-air duct refrigerant or detect the low pressure oil storage tank through the 3rd magnetic valve flow into the temperature of the lubricating oil in invariable frequency compressor and the frequency-changeable compressor the 4th temperature-detecting device, be used to detect the 5th temperature-detecting device of temperature that flows to the refrigerant of low-pressure liquid storing tank through cross valve.
The utility model is through the running status of oil circuit control module according to frequency-changeable compressor and invariable frequency compressor in the connected machine; Carry out corresponding oil circuit control; Thereby can guarantee that the oil mass in the compressor is sufficient, and the compressor oil starvation can not occur or divide oil uneven phenomenon.In addition; In oil circuit control, also need to judge whether the oil return operation through the oil return detection module; And when the needs oil return moves, starting oil return in time handles; Making does not need regularly to carry out oil return in the complete machine running, handles and when the needs oil return, start oil return, and then has realized intelligent oil return.
Description of drawings
Fig. 1 is the structural representation of the utility model connected machine system preferred embodiment;
Fig. 2 is the schematic flow sheet of control method one embodiment of compressor lubricant oil in the utility model connected machine system;
Fig. 3 carries out the schematic flow sheet that oil circuit is controlled an embodiment in the control method of compressor lubricant oil in the utility model connected machine system, and wherein invariable frequency compressor operation, frequency-changeable compressor operate in medium-high frequency or low frequency;
Fig. 4 is the oil mass sketch map of the utility model connected machine system each parts in running, and wherein invariable frequency compressor operation, frequency-changeable compressor operate in the medium-high frequency state;
Fig. 5 is the oil mass sketch map of the utility model connected machine system each parts in running, and wherein invariable frequency compressor operation, frequency-changeable compressor operate in the low frequency state;
The oil mass sketch map of Fig. 6 each parts when to be the utility model connected machine system according to control method shown in Figure 3 carry out oil circuit control;
The oil mass sketch map of Fig. 7 each parts when to be the utility model connected machine system according to control method shown in Figure 3 carry out oil circuit control;
When Fig. 8 carries out oil return when to be the utility model connected machine system according to control method shown in Figure 3 carry out oil circuit control, the oil mass sketch map of each parts;
Fig. 9 is the schematic flow sheet that carries out another embodiment of oil circuit control in the control method of compressor lubricant oil in the utility model connected machine system, and wherein frequency-changeable compressor operation, invariable frequency compressor are out of service;
The oil mass sketch map of Figure 10 each parts when to be the utility model connected machine system according to control method shown in Figure 9 carry out oil circuit control;
The oil mass sketch map of Figure 11 each parts when to be the utility model connected machine system according to control method shown in Figure 9 carry out oil circuit control;
The oil mass sketch map of Figure 12 when to be the utility model connected machine system according to control method shown in Figure 9 carry out oil circuit control;
The oil mass sketch map of each parts when Figure 13 carries out oil return when to be the utility model connected machine system according to control method shown in Figure 9 carry out oil circuit control;
Figure 14 is the schematic flow sheet of another embodiment of control method of compressor lubricant oil in the utility model connected machine system;
Figure 15 is the oil mass sketch map of each parts before the first operation of connected machine among another embodiment of control method of compressor lubricant oil in the utility model connected machine system;
Figure 16 is the oil mass sketch map that the connected machine moves each parts of back for the first time among another embodiment of control method of compressor lubricant oil in the utility model connected machine system.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
The specific embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
General connected machine system includes a frequency-changeable compressor and at least one invariable frequency compressor.Invariable frequency compressor is meant that the rotating speed of its motor fixes, so the circulation of the refrigerant in the fixed frequency air conditioner machine also is a constant.The internal circulating load of refrigerant is big more within a certain period of time, and then power output is high more.Frequency-changeable compressor is meant the invariable frequency compressor that relative rotation speed is fixing, makes the rotating speed of its motor regulate continuously within the specific limits through control, thereby changes its output energy.Therefore, the circulation of the refrigerant in the inverter air conditioner changes, and its return-air amount also can change along with running status.For example, when frequency-changeable compressor operated in high frequency, its return-air amount increased; When frequency-changeable compressor operated in the low frequency state, its return-air amount reduced.And the return-air amount of invariable frequency compressor is constant, so makes frequency-changeable compressor and invariable frequency compressor compressor oil starvation or the uneven problem of branch oil in running, may occur.
To the problems referred to above, the utility model proposes a kind of connected machine system, makes in its running, guarantees that the lubricating oil between each compressor is balanced, and realizes intelligent oil return.
With reference to Fig. 1, Fig. 1 is the structural representation of the utility model connected machine system.The utility model embodiment connected machine system comprises: frequency-changeable compressor 1; Invariable frequency compressor 2; Frequency conversion oil eliminator 3; Fixed oil eliminator 4 frequently; Oil storage tank 5; Low-pressure liquid storing tank 6; Cross valve 7; First check valve 16; Second check valve 17 and the 3rd check valve 15; Second magnetic valve 9; First magnetic valve 10; The 3rd magnetic valve 8 and the 4th magnetic valve 11; The first temperature-detecting device T1A; The 3rd temperature-detecting device T1B; The 4th temperature-detecting device T2A; The 5th temperature-detecting device T2B; The second temperature-detecting device T2C; Filter; Capillary (12; 13; 14) or the like.Wherein, In the connected machine system; Oil storage tank 5, first magnetic valve 10, second magnetic valve 9, the 3rd check valve 15, second pipeline 19 and capillary 14 are formed the oil circuit control modules; This oil circuit control module is used for according to the operating frequency of frequency-changeable compressor 1 and the running status of invariable frequency compressor 2, carries out corresponding oil circuit control.The first temperature-detecting device T1A, the second temperature-detecting device T2C form the oil return checkout gear; This oil return checkout gear is used for when carrying out oil circuit control; Need to judge whether the oil return operation; And startup oil return when the needs oil return moves, even thereby compressor increases the flow velocity of circulation refrigerant with high-volume run, take back compressor to the lubricating oil that is trapped in heat exchanger and be connected in the pipeline.
Particularly, the exhaust outlet of frequency-changeable compressor 1 is connected with first pipeline 20 through frequency conversion oil eliminator 3, first check valve 16, and the exhaust outlet of invariable frequency compressor 3 is connected with first pipeline 20 through fixed oil eliminator 4, second check valve 17 frequently.The other end of first pipeline 20 is connected with cross valve 7, and this cross valve 7 is connected with first pipeline 20, indoor set, off-premises station heat exchanger and low-pressure liquid storing tank 6 respectively.Because frequency-changeable compressor 1 is when discharging refrigerant; Maybe frequency-changeable compressor 1 inner lubricating oil be discharged; So can carrying out the refrigerant that frequency-changeable compressor 1 is discharged oil, separates by frequency conversion oil eliminator 3; Thereby the oil in the refrigerant is separated out and remains in the frequency conversion oil eliminator 3, and refrigerant will flow to indoor set, outdoor heat exchanger or low-pressure liquid storing tank 6 through first check valve 16, pipeline 20.In like manner; The refrigerant that fixed oil eliminator 4 is frequently discharged invariable frequency compressor 2 carries out oil to be separated; Thereby the oil in the refrigerant separated out and remain in decide in the frequency oil eliminator 4, and refrigerant will flow to indoor set, outdoor heat exchanger or low-pressure liquid storing tank 6 through second check valve 17, first pipeline 20.The import of low-pressure liquid storing tank 6 is connected with cross valve 7; The outlet of low-pressure liquid storing tank 6 is connected with the return-air mouth of frequency-changeable compressor 1, invariable frequency compressor 2 respectively through total return-air duct 21, and the bottom oil drain out of low-pressure liquid storing tank 6 is connected with total return-air duct 21 through the 3rd magnetic valve 8.In addition, first pipeline 20 also is connected with total return-air duct 21 through the 4th magnetic valve 11.
The bottom oil return opening of above-mentioned frequency conversion oil eliminator 3 is connected with the return-air mouth of invariable frequency compressor 2 through capillary 13; Thereby the refrigerant of discharging in 3 pairs of frequency-changeable compressors 1 of frequency conversion oil eliminator is carried out that oil separates and the lubricating oil that obtains; Under the condition of height pressure differential, flow back to invariable frequency compressor 2 through capillary 13; The bottom oil return opening of fixed oil eliminator 4 frequently is connected with the return-air mouth of frequency-changeable compressor 1 through capillary 12; The lubricating oil that obtains thereby the refrigerant that will decide to discharge in 4 pairs of invariable frequency compressors 2 of frequency oil eliminator carries out the oil separation; Under the condition of height pressure differential, flow back to frequency-changeable compressor 1 through capillary 12.In addition, the bottom oil return opening of fixed oil eliminator 4 frequently also is connected with oil storage tank 5 through second magnetic valve 9, thereby can be so that the lubricating oil in the fixed oil eliminator 4 frequently flows back to oil storage tank 5 under the condition of height pressure differential through the closure of controlling second magnetic valve 9.An end that is connected with second magnetic valve 9 of oil storage tank 5 also is connected with first pipeline 20 through second pipeline 19; The outlet of the top of oil storage tank 5 is connected with capillary 14 through the 3rd check valve 15, is used for refrigerant is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through the 3rd check valve 15, capillary 14; The lower part outlet of oil storage tank 5 is connected with capillary 14 through first magnetic valve 10, and the other end of capillary 14 is connected with total return-air duct 21, the return-air mouth of frequency-changeable compressor 1 and the return-air mouth of invariable frequency compressor 2 respectively.
The above-mentioned first temperature-detecting device T1A is arranged on the pipeline of the exhaust outlet that connects frequency-changeable compressor 1 and frequency conversion oil eliminator 3, is used for detecting the temperature from the refrigerant of frequency-changeable compressor 1 discharge; The 3rd temperature-detecting device T1B is arranged on exhaust outlet that connects invariable frequency compressor 2 and the pipeline of deciding frequency oil eliminator 4, is used for detecting the temperature from the refrigerant of invariable frequency compressor 2 discharges; The 4th temperature-detecting device T2A is arranged on total return-air duct 21 near the position of two compressor return air mouths, and the bottom oil drain out that is used for detecting the temperature of total return-air duct 21 refrigerants or detect low pressure oil storage tank 6 flows into the temperature of the lubricating oil in the compressors through the 3rd magnetic valve 8; The 5th temperature-detecting device T2B is arranged on the pipeline of the import that connects low-pressure liquid storing tank 6 and cross valve 7, is used to detect the temperature that flows to the refrigerant of low-pressure liquid storing tank 6 through cross valve 7; The second temperature-detecting device T2C is arranged on the pipeline that connects capillary 14 and two compressor return air mouths, is used to detect the temperature of mixture that flows to refrigerant and the lubricating oil of each compressor through oil storage tank 5, capillary 14.
Because under identical height pressure differential condition; The different flow velocitys that cause with the resistance of high temperature refrigerant when capillary of gaseous state of liquid high temperature grease are different; Liquid lubricating oil during through capillary flow velocity low and thermal loss is big; Flow velocity height and thermal loss were little when the refrigerant of gaseous state passed through capillary; So the difference of the temperature that the temperature that is detected according to the first temperature-detecting device T1A and the second temperature-detecting device T2C are detected, whether capillary 14 in have lubricating oil flow through, promptly judge whether there is lubricating oil in the oil storage tank 5 if can judge.Therefore; Through temperature detection, comparison, can judge the oil mass in frequency-changeable compressor 1, invariable frequency compressor 2, frequency conversion oil eliminator 3, fixed oil eliminator 4 frequently, the oil storage tank 5, thereby choose best oil return opportunity; And no longer need carry out the timing oil return, and then realized intelligent oil return.
The utility model is through the running status of oil circuit control module according to frequency-changeable compressor 1 in the connected machine and invariable frequency compressor 2; Carry out corresponding oil circuit control; Thereby can guarantee that the oil mass in the compressor is sufficient, and the compressor oil starvation can not occur or divide oil uneven phenomenon.In addition; In oil circuit control, also need to judge whether the oil return operation through the oil return detection module; And when the needs oil return moves, starting oil return in time handles; Making does not need regularly to carry out oil return in the complete machine running, handles and when the needs oil return, start oil return, and then has realized intelligent oil return.
With reference to Fig. 2, it is the schematic flow sheet of control method one embodiment of compressor lubricant oil in the utility model connected machine system.The control method of compressor lubricant oil may further comprise the steps in the connected machine system of the utility model embodiment:
Step S01, according to the operating frequency of frequency-changeable compressor 1 and the running status of invariable frequency compressor 2, carry out the control of corresponding oil circuit;
Particularly, in the course of work of connected machine, the operating frequency of frequency-changeable compressor 1 and the running status of invariable frequency compressor 2 are monitored, and carry out corresponding oil circuit control, so that the lubricating oil between each compressor is balanced according to this monitoring result.The operating frequency of frequency-changeable compressor 1 is specially low frequency, intermediate frequency and high frequency, embodies the load variations of frequency-changeable compressor 1.For example; As shown in Figure 1, when needs invariable frequency compressor 2 out of service, and when only needing frequency-changeable compressor 1 operation; Then can carry out the control of corresponding oil circuit, the lubricating oil of deciding in the frequency oil eliminator 4 of invariable frequency compressor 2 is flowed in the frequency-changeable compressors 1 via oil storage tank 5 through the oil circuit control module.
Step S02, when carrying out oil circuit control, need to judge whether the oil return operation, and startup oil return when the needs oil return move.
When oil circuit is controlled, need also need judge whether the oil return operation, and when the needs oil return moves, start oil return and handle.For example, out of service when needs invariable frequency compressor 2, and in the oil circuit control of carrying out when only needing frequency-changeable compressor 1 operation, judge through the oil return detection module whether lubricating oil is arranged in the oil storage tank 5, if do not have, then judgements needs the oil return operation, and then startup oil return processing.
The utility model is through the running status of frequency-changeable compressor 1 and invariable frequency compressor 2 in the detection connected machine; And carry out corresponding oil circuit according to running status and control; Thereby can guarantee that the oil mass in the compressor is sufficient, and the compressor oil starvation can not occur or divide oil uneven phenomenon.In addition; In oil circuit control, need also to judge whether the oil return operation, and when the needs oil return moves, start the oil return processing in time, making does not need regularly to carry out oil return in the complete machine running; Handle and when the needs oil return, start oil return, and then realized intelligent oil return.
With reference to Fig. 3, it is in the control method of compressor lubricant oil in the utility model connected machine system, the schematic flow sheet of the oil circuit control when frequency-changeable compressor operates in medium-high frequency or low frequency state, invariable frequency compressor operation.This oil circuit control step specifically comprises:
Step S201, control will be decided frequently, and oil eliminator 4 interior lubricating oil flow in the oil storage tank 5;
When invariable frequency compressor 2 operations; When frequency-changeable compressor 1 operates in the medium-high frequency state; The capacity of invariable frequency compressor 2 and frequency-changeable compressor 1 is more or less the same; So its recirculating oil quantity is basically identical also, promptly the frequency conversion oil eliminator 3 of frequency-changeable compressor 1 and invariable frequency compressor 2 decide the oil mass basically identical in the frequency oil eliminator 4, as shown in Figure 4.Refrigerant in the pipeline 19 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through oil storage tank 5, the 3rd check valve 15, capillary 14.After the oil separation of the refrigerant that frequency-changeable compressor 1 is discharged through frequency conversion oil eliminator 3, refrigerant is delivered to pipeline 20 through first check valve 16, and the lubricating oil that remain in the frequency conversion oil eliminator 3 flow back to invariable frequency compressor 2 through capillary 13; After the oil separation of the refrigerant that invariable frequency compressor 2 is discharged through fixed oil eliminator 4 frequently, refrigerant is delivered to pipeline 20 through second check valve 17, remains in the lubricating oil of deciding in the frequency oil eliminator 4 and flows back to frequency-changeable compressor 1 through capillary 12.
And when the invariable frequency compressor operation, when frequency-changeable compressor operated in the low frequency state, frequency-changeable compressor 1 was few through the return-air amount of low-pressure liquid storing tank 6, and invariable frequency compressor 2 is many through the return-air amount of low-pressure liquid storing tank 6.Therefore the decline of frequency-changeable compressor 1 pasta, the rising of invariable frequency compressor 2 pastas will appear in this connected machine behind long-play, and then make that frequency conversion oil eliminator 3 interior oil masses descend, the 4 interior oil masses risings of fixed frequency oil eliminator, and be as shown in Figure 5.The running of this connected machine repeats no more at this with above-mentioned consistent.
At this moment; Open second magnetic valve 9 and (for example continue first preset time; 1 minute) after close, the purpose of this first preset time is to make to decide frequency oil eliminator 4 and have a certain amount of lubricating oil to flow in the oil storage tank 5 and guarantee that the fixed lubricating oil of oil eliminator 4 frequently have certain surplus, make follow-up testing process effective; Specifically can rule of thumb be provided with, not limit at this.When second magnetic valve 9 is opened, make that the lubricating oil in the fixed oil eliminator 4 frequently flows in the oil storage tank 5, as shown in Figure 6.The lubricating oil that retains in the fixed oil eliminator 4 frequently flows in the oil storage tank 5 through second magnetic valve 9, thereby the pasta of lubricating oil rises in the oil storage tank 5, and the pasta in the fixed oil eliminator 4 frequently descends.
Step S202, control are flowed back to the lubricating oil in the oil storage tank 5 in invariable frequency compressor 2 and the frequency-changeable compressor 1.
After second magnetic valve 9 cuts out; Open first magnetic valve 10 again and (for example continued for the second preset time time; 1 minute) after close, let the lubricating oil that enters oil storage tank 5 by fixed oil eliminator 4 frequently flow back to frequency-changeable compressor 1 and invariable frequency compressor 2 through first magnetic valve 10, as shown in Figure 7.When first magnetic valve 10 is opened; Lubricating oil in the oil storage tank 5 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through first magnetic valve 10, capillary 14; Thereby make the pasta in the frequency-changeable compressor 1 rise; Pasta in the frequency conversion oil eliminator 3 also rises, and makes that finally the lubricating oil in frequency-changeable compressor 1 and the invariable frequency compressor 2 reaches balanced.
Second preset time that above-mentioned first magnetic valve 10 is opened mainly is to guarantee that the lubricating oil in the oil storage tank 5 can flow, and can confirm through visual fuel head meter is installed on oil storage tank 5 when specifically being provided with, and does not limit at this.Through the control of this oil circuit, make oil mass balance in frequency-changeable compressor 1 and the invariable frequency compressor 2.
Above-mentioned steps S02 is specially:
When carrying out oil circuit control, judge whether there is lubricating oil in the oil storage tank 5, otherwise start oil return.
In above-mentioned oil circuit control, owing to need the lubricating oil in the oil storage tank 5 be delivered in each compressor through capillary 14, so the temperature of T2C will change.So can judge in the oil storage tank 5 whether to also have lubricating oil through the variations in temperature of T2C, that is the difference between the temperature that is detected according to temperature that T1A detected and T2C changes, whether in addition can judge in the oil storage tank 5 lubricating oil.When temperature value that T2C detected diminishes in the process that first magnetic valve 10 is opened, explained that lubricating oil flows through capillary 14, then need not carry out the oil return operation, as shown in Figure 7; Otherwise will carry out the oil return operation, as shown in Figure 8.In the process of oil return, second magnetic valve, 9 closures.The lubricating oil that retains in the pipeline of circulation with system's indoor set through refrigerant flows back into frequency-changeable compressor 1 and invariable frequency compressor 2 through cross valve 7, low-pressure liquid storing tank 6, total return-air duct 21; Thereby the pasta in frequency-changeable compressor 1 and the invariable frequency compressor 2 is risen, and the pasta in frequency conversion oil eliminator 3 and the fixed oil eliminator 4 frequently also rises.Simultaneously, the refrigerant in second pipeline 19 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through oil storage tank 5, the 3rd check valve 15, capillary 14.After the oil separation of the refrigerant that frequency-changeable compressor 1 is discharged through frequency conversion oil eliminator 3, refrigerant is delivered to first pipeline 20 through first check valve 16, and the lubricating oil that remain in the frequency conversion oil eliminator 3 flow back to invariable frequency compressor 2 through capillary 13; After the oil separation of the refrigerant that invariable frequency compressor 2 is discharged through fixed oil eliminator 4 frequently, refrigerant is delivered to first pipeline 20 through second check valve 17, remains in the lubricating oil of deciding in the frequency oil eliminator 4 and flows back to frequency-changeable compressor 1 through capillary 12.When second magnetic valve 9 was opened, the lubricating oil that retains in the fixed oil eliminator 4 frequently also flowed in the oil storage tank 5 through second magnetic valve 9, thereby the pasta of lubricating oil rises in the oil storage tank 5.Because the oil return process is the set time, the time that therefore can calculate a cycle period according to the flow velocity and the charging amount of refrigerant in advance, this time is exactly the required time of oil return process.In this time, the pasta in compressor and the oil eliminator rises to suitable height gradually, and oil return this moment finishes, and second magnetic valve 9 will cut out, and open first magnetic valve 10 simultaneously.As shown in Figure 7; When first magnetic valve 10 is opened; Lubricating oil in the oil storage tank 5 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through first magnetic valve 10, capillary 14; Thereby make the pasta in the frequency-changeable compressor 1 rise, the pasta in the frequency conversion oil eliminator 3 also rises, and makes that finally the lubricating oil in frequency-changeable compressor 1 and the invariable frequency compressor 2 reaches balanced.This control can accurately be judged the optimum that oil return gets into, and can effectively prolong the oil return cycle.
With reference to Fig. 9, it is in the control method of compressor lubricant oil in the utility model connected machine system, needs frequency-changeable compressor operation, and the schematic flow sheet of the oil circuit control of invariable frequency compressor when out of service.This oil circuit control step specifically comprises:
Step S901, control will be decided frequently, and oil eliminator 4 interior lubricating oil flow in the oil storage tank 5;
When needs invariable frequency compressor 2 was out of service, possibly still there was lubricating oil in its fixed oil eliminator 4 frequently.So before invariable frequency compressor 2 is out of service, can the lubricating oil of deciding in the oil eliminator 4 frequently all be entered in the oil storage tank 5, supply frequency-changeable compressor 1 to utilize.Therefore, opening second magnetic valve 9 earlier also continues to close behind the 3rd preset time (for example, 1 minute); Make the lubricating oil in the fixed oil eliminator 4 frequently flow in the oil storage tank 5; Shown in figure 10, the pasta in the oil storage tank 5 will rise, and the pasta in the fixed oil eliminator 4 frequently will descend.The 3rd preset time can be set as the case may be, in the 3rd preset time, must guarantee that the lubricating oil in the fixed oil eliminator 4 frequently all flows in the oil storage tank 5, specifically can calculate through the capacity of oil eliminator 4 and the flow velocity of lubricating oil.When closing second magnetic valve 9, also close invariable frequency compressor 2.
Step S902, control are flowed back to frequency-changeable compressor 1 with the lubricating oil in the oil storage tank 5.
Control first magnetic valve, 10 interval certain hours and open and lasting the 4th preset time (for example, 2 minutes), the lubricating oil in the oil storage tank 5 are under high pressure flowed in the frequency-changeable compressor 1, shown in figure 11.Refrigerant in second pipeline 19 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through oil storage tank 5, the 3rd check valve 15, capillary 14.After the oil separation of the refrigerant that frequency-changeable compressor 1 is discharged through frequency conversion oil eliminator 3, refrigerant is delivered to pipeline 20 through first check valve 16, and the lubricating oil that remain in the frequency conversion oil eliminator 3 flow back to frequency-changeable compressor 1 through capillary 13; Invariable frequency compressor 2 is out of service.When first magnetic valve 10 is opened; Lubricating oil in the oil storage tank 5 is delivered to frequency-changeable compressor 1 through first magnetic valve 10, capillary 14; Thereby after making that invariable frequency compressor 2 is out of service; The lubricating oil that retains in the fixed oil eliminator 4 frequently will all flow in the frequency-changeable compressor 1, thereby guarantee that the lubricating oil in the frequency-changeable compressor 1 does not lack.
Above-mentioned steps S02 is specially:
Judge whether there is lubricating oil in the oil storage tank 5, otherwise start invariable frequency compressor 2, start oil return simultaneously, and after oil return finishes, close invariable frequency compressor 2.
When opening first magnetic valve 10 and make lubricating oil in the oil storage tank 5 flow in the frequency-changeable compressor 1; The value of the second temperature-detecting device T2C with open first magnetic valve 10 before whether change; When the value of the second temperature-detecting device T2C diminishes, can judge has the lubricating oil process in the capillary 14, promptly also have lubricating oil in the oil storage tank 5; Then need not carry out the oil return operation, shown in figure 11; When the value of the second temperature-detecting device T2C was constant, can judge did not have the lubricating oil process in the capillary 14, and promptly lubricating oil has been arranged in the oil storage tank 5, can't guarantee that the lubricating oil capacity in the frequency-changeable compressor 1 is used.Frequency-changeable compressor 1 interior fuel head will descend this moment, and the oil mass of frequency conversion oil eliminator 3 also can correspondingly descend, and is shown in figure 12.Therefore, need to start invariable frequency compressor 2 and carry out the oil return processing, shown in figure 13.In the process of oil return, second magnetic valve, 9 closures.The oil that retains in the pipeline of circulation with system's indoor set through refrigerant flows back into frequency-changeable compressor 1 and invariable frequency compressor 2 through cross valve 7, low-pressure liquid storing tank 6, pipeline 21.Simultaneously, the refrigerant in second pipeline 19 is delivered to frequency-changeable compressor 1 and invariable frequency compressor 2 through oil storage tank 5, the 3rd check valve 15, capillary 14.After the oil separation of the refrigerant that frequency-changeable compressor 1 is discharged through frequency conversion oil eliminator 3, refrigerant is delivered to first pipeline 20 through first check valve 16; The lubricating oil that remains in the frequency conversion oil eliminator 3 flows back to frequency-changeable compressor 1 through capillary 13.The refrigerant that invariable frequency compressor 2 is discharged is after the oil of frequency conversion oil eliminator 4 separates, and refrigerant is delivered to first pipeline 20 through second check valve 17; Remain in the lubricating oil of deciding in the frequency oil eliminator 4 and flow back to frequency-changeable compressor 1 through capillary 12.And when second magnetic valve 9 was opened, the lubricating oil that retains in the fixed oil eliminator 4 frequently also flowed in the oil storage tank 5 through second magnetic valve 9, thereby the pasta of lubricating oil rises in the oil storage tank 5.After oil return finishes, second magnetic valve 9 will cut out, and will be simultaneously that invariable frequency compressor 2 is out of service, and open first magnetic valve 10.When first magnetic valve 10 was opened, the lubricating oil in the oil storage tank 5 was delivered to frequency-changeable compressor 1 through first magnetic valve 10, capillary 14, thereby makes the pasta in the frequency-changeable compressor 1 rise, and the pastas in the frequency conversion oil eliminator 3 also rise.Lubricating oil oil mass in each parts is shown in figure 11 at this moment.Can prolong the oil return cycle when having only frequency-changeable compressor to move through this control, can accurately judge the optimum time point of oil return entering, the phenomenon of frequent oil return in the time of the complete machine underrun can not occurring.
With reference to Figure 14, it is the schematic flow sheet of another embodiment of control method of compressor lubricant oil in the utility model connected machine system.On the basis of the foregoing description, the control method of compressor lubricant oil also comprises in the utility model embodiment connected machine system:
Step S03, when the connected machine uses for the first time, control the lubricating oil that presets in the oil storage tank 5 is all flowed in invariable frequency compressor 2 and the frequency-changeable compressor 1.
After completion vacuumizes and fills refrigerant in the final assembly process, fill lubricating oil from oil storage tank 5 pouring orifices 18.Wherein, the oil mass that fills can obtain through long pipe arrangement reliability service experiment test.Among the utility model embodiment, in this oil storage tank 5, fill 4 liters lubricating oil.Shown in figure 15, there is not lubricating oil in preceding two oil eliminators of connected machine off-duty, every compressor is marked with 0.5 liter lubricating oil when dispatching from the factory.After pressing the connected machine to start operation, the pressure in the oil storage tank 5 is consistent with pressure at expulsion, is in high pressure, and first magnetic valve 10 is opened, and the lubricating oil in the oil storage tank 5 flows in each compressor through the return-air mouth of capillary 14 from frequency-changeable compressor 1 and invariable frequency compressor 2.The fuel head of each compressor begins to rise, and then also begins to store isolated lubricating oil in each oil eliminator.At this moment; Difference between the temperature that the temperature that is detected according to the first temperature-detecting device T1A and the second temperature-detecting device T2C are detected; Can judge whether also have lubricating oil in the oil storage tank 5, thereby after the lubricating oil in judging oil storage tank 5 has all been arranged, close first magnetic valve 10.At this moment, the lubricating oil oil mass in each parts is shown in figure 16.
The above is merely the preferred embodiment of the utility model; Be not so limit its claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (8)
1. a connected machine system comprises frequency-changeable compressor, invariable frequency compressor, frequency conversion oil eliminator, fixed oil eliminator, cross valve, first check valve, second check valve, first pipeline, some capillaries frequently; The exhaust outlet of said frequency-changeable compressor is connected with cross valve through frequency conversion oil eliminator, first check valve, first pipeline, and the oil return opening of said frequency conversion oil eliminator is connected with the return-air mouth of invariable frequency compressor through capillary; The exhaust outlet of said invariable frequency compressor is connected with cross valve through fixed oil eliminator, second check valve, first pipeline frequently, and the oil return opening of said fixed oil eliminator frequently is connected with the return-air mouth of frequency-changeable compressor through capillary; It is characterized in that, also comprise:
Be used for carrying out the oil circuit control module that oil circuit is controlled according to the operating frequency of frequency-changeable compressor and the running status of invariable frequency compressor; Comprise oil storage tank, first magnetic valve, second magnetic valve, second pipeline and the 3rd check valve; The top outlet of said oil storage tank is connected with an end of the 3rd check valve; The lower part outlet of said oil storage tank is connected with an end of first magnetic valve, and the other end of the other end of the 3rd check valve and first magnetic valve all is connected with frequency-changeable compressor and invariable frequency compressor through capillary; The top outlet of said oil storage tank also is connected with fixed oil eliminator frequently through second magnetic valve; The end that said oil storage tank is connected with magnetic valve also is connected with first pipeline through second pipeline;
Be used for when carrying out oil circuit control; Need to judge whether the oil return operation; And needing oil return when operation to start the oil return detection module of oil return, comprise first temperature-detecting device of the temperature that is used to detect the refrigerant of carrying between frequency-changeable compressor and the frequency conversion oil eliminator and be used to detect second temperature-detecting device of the surface temperature capillaceous between second magnetic valve and frequency-changeable compressor and the invariable frequency compressor; Said first temperature-detecting device is arranged on the pipeline of the exhaust outlet that connects said frequency-changeable compressor and said frequency conversion oil eliminator, and said second temperature-detecting device is arranged on the pipeline of the said capillary of connection and frequency-changeable compressor and invariable frequency compressor return-air mouth.
2. connected machine according to claim 1 system; It is characterized in that; Said first magnetic valve in the said oil circuit control module moves at invariable frequency compressor, and is when frequency-changeable compressor is in medium-high frequency when operation or low-frequency operation, closed and continue to break off behind first preset time; Said second magnetic valve breaks off behind closed and lasting second preset time after first magnetic valve breaks off.
3. connected machine according to claim 2 system; It is characterized in that; The temperature that said oil return detection module is detected at the temperature that is detected according to first temperature-detecting device and second temperature-detecting device is judged to start oil return when not having lubricating oil in the oil storage tank.
4. connected machine according to claim 1 system is characterized in that said first magnetic valve in the said oil circuit control module moves at frequency-changeable compressor, and is when invariable frequency compressor is out of service, closed and continue to break off behind the 3rd preset time; Said second magnetic valve breaks off behind closed and lasting the 4th preset time after first magnetic valve breaks off.
5. connected machine according to claim 4 system; It is characterized in that; The temperature that said oil return detection module is detected at the temperature that is detected according to first temperature-detecting device and second temperature-detecting device; Do not judge when not having lubricating oil in the oil storage tank to start invariable frequency compressor, start oil return simultaneously, and after oil return finishes, close invariable frequency compressor.
6. according to each described connected machine system in the claim 1 to 5; It is characterized in that; Said first magnetic valve in the said oil circuit control module is closed when the connected machine uses for the first time; And the temperature that the temperature that is detected according to first temperature-detecting device at said oil return detection module and second temperature-detecting device are detected is judged and is closed said first magnetic valve when lubricating oil in the oil storage tank has all been arranged.
7. according to each described connected machine system in the claim 1 to 5, it is characterized in that, also comprise low-pressure liquid storing tank, the 3rd magnetic valve, the 4th magnetic valve, total return-air duct, indoor set and off-premises station heat exchanger; Said cross valve is connected with first pipeline, indoor set, off-premises station heat exchanger and low-pressure liquid storing tank respectively; The outlet of said low-pressure liquid storing tank through total return-air duct respectively with the return-air buckle of said frequency-changeable compressor and invariable frequency compressor, the bottom oil drain out of said low-pressure liquid storing tank is connected with total return-air duct through the 3rd magnetic valve; Said first pipeline also is connected with total return-air duct through the 4th magnetic valve.
8. connected machine according to claim 7 system; It is characterized in that, also comprise the 3rd temperature-detecting device of the temperature that is used for detecting the refrigerant of discharging from invariable frequency compressor, the bottom oil drain out that is used for detecting the temperature of total return-air duct refrigerant or detect the low pressure oil storage tank through the 3rd magnetic valve flow into the temperature of the lubricating oil in invariable frequency compressor and the frequency-changeable compressor the 4th temperature-detecting device, be used to detect the 5th temperature-detecting device of temperature that flows to the refrigerant of low-pressure liquid storing tank through cross valve.
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| CN201220165933.2U CN202581984U (en) | 2012-04-18 | 2012-04-18 | Frequency-conversional multi-connected air-conditioning system |
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| CN201220165933.2U CN202581984U (en) | 2012-04-18 | 2012-04-18 | Frequency-conversional multi-connected air-conditioning system |
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| CN103471298A (en) * | 2013-08-30 | 2013-12-25 | 青岛海信日立空调系统有限公司 | Multi-connected air-conditioner oil control system and oil control method |
| CN104236169A (en) * | 2014-09-30 | 2014-12-24 | 宁波奥克斯电气有限公司 | Oil return control method for fully constant frequency multi-connected air conditioning unit |
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| CN107036245A (en) * | 2017-04-25 | 2017-08-11 | 广东美的暖通设备有限公司 | The control device and method of multiple on-line system and its outdoor compressor |
| CN107036245B (en) * | 2017-04-25 | 2020-01-07 | 广东美的暖通设备有限公司 | Multi-split air conditioner system and control device and method of outdoor compressor thereof |
| CN108072204A (en) * | 2017-12-13 | 2018-05-25 | 宁波奥克斯电气股份有限公司 | A kind of multi-joint machine oil balance control method and device |
| CN108072204B (en) * | 2017-12-13 | 2020-07-03 | 宁波奥克斯电气股份有限公司 | Multi-connected engine oil balance control method and device |
| CN111924354A (en) * | 2020-06-03 | 2020-11-13 | 中国民用航空飞行学院 | Multifunctional oil storage tank set device and multifunctional realization method |
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| CN111811112A (en) * | 2020-07-13 | 2020-10-23 | 南京天加环境科技有限公司 | Intelligent oil return multi-split air conditioner system |
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